10. Lego iPod Case

9. Han Solo Frozen in Carbonite

Nathan Sawaya used over 10,000 Lego pieces and spent 3 months making this "Han Solo in Carbonite" masterpiece.
[NathanBrickArtist]

8. Lego Volvo XC90

Built by Lego Master Model Builders, this Volvo XC90 is the official car of Legoland California.
[car.kak.net]

7. Lego NES Case

If Nintendo came out with a Lego NES case, this would be it. Everything is 100% Lego - power/reset buttons, controller ports, LED light cover, and even the vents up top. One more picture here.
[RetroNintendo]

5. Lego Pinhole Camera

This person took a Polaroid 95a, stripped it down, and than reassembled the camera with all Lego parts. Like a real mechanical 35mm camera, it includes a manual crank which takes 23 clicks to advance one frame.
[FoundPhotography]

4. Lego Knitting Machine

Rarely do we come accross something so interesting yet odd, take a look at this fully functional knitting machine made entirely out of Lego pieces.
[TRFJ]

3. Lego Difference Engine

One of the most imaginative Lego creations ever. Made by Andy Carroll, this difference engine is able to solve mathematical problems (2nd/3rd-order polynomials) and calculate the answers to 3 or 4 digits.
[Gizmodo]

2. Lego Air Conditioner

Behold, a functional Lego replica of Carrier's latest air conditioner, complete with valves, compressor, and working fan.
[Make]

1. Lego Pinball Machine

Created by Lego fanatics Gerrit Bronsveld and Martijn Boogaarts of the Netherlands, this fully functional pinball machine was made using over 20,000 of these colorful blocks. The Lego Pinball Machine features an operational coin slot, rotation bumpers, auto kickback, 5-digit mechanical display (for points), 13 RCX Mindstorms computers, and even a ramp.
[PinballNews]

Honorable Mention - Lego gMac 475

If you liked the Lego PC, check out this Lego gMac 475 (constructed from a Macintosh LC 475 ), an oldie but goodie. (Thanks, Jeff)

Honorable Mention - Lego Brick USB Drive

Lego blocks can be used to build just about anything these days, including this USB drive. Its even got clear backing so you can view the innards. Instructions on how to build your own can be found here.
[Brickshelf]